142 lines
4.5 KiB
C
142 lines
4.5 KiB
C
#include "sysutil.h"
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#include <stdlib.h>
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#include <env.h>
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#include <string.h>
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/*=========================================================================*
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* env_parse *
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*=========================================================================*/
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PUBLIC int env_parse(env, fmt, field, param, min, max)
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char *env; /* environment variable to inspect */
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char *fmt; /* template to parse it with */
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int field; /* field number of value to return */
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long *param; /* address of parameter to get */
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long min, max; /* minimum and maximum values for the parameter */
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{
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/* Parse an environment variable setting, something like "DPETH0=300:3".
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* Panic if the parsing fails. Return EP_UNSET if the environment variable
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* is not set, EP_OFF if it is set to "off", EP_ON if set to "on" or a
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* field is left blank, or EP_SET if a field is given (return value through
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* *param). Punctuation may be used in the environment and format string,
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* fields in the environment string may be empty, and punctuation may be
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* missing to skip fields. The format string contains characters 'd', 'o',
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* 'x' and 'c' to indicate that 10, 8, 16, or 0 is used as the last argument
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* to strtol(). A '*' means that a field should be skipped. If the format
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* string contains something like "\4" then the string is repeated 4 characters
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* to the left.
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*/
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char *val, *end;
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char value[EP_BUF_SIZE];
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char PUNCT[] = ":,;.";
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long newpar;
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int s, i, radix, r;
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if ((s=env_get_param(env, value, sizeof(value))) != 0) {
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if (s == ESRCH) return(EP_UNSET); /* only error allowed */
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printf("WARNING: env_get_param() failed in env_parse(): %d\n",s);
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return(EP_EGETKENV);
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}
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val = value;
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if (strcmp(val, "off") == 0) return(EP_OFF);
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if (strcmp(val, "on") == 0) return(EP_ON);
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i = 0;
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r = EP_ON;
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for (;;) {
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while (*val == ' ') val++; /* skip spaces */
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if (*val == 0) return(r); /* the proper exit point */
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if (*fmt == 0) break; /* too many values */
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if (strchr(PUNCT, *val) != NULL) {
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/* Time to go to the next field. */
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if (strchr(PUNCT, *fmt) != NULL) i++;
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if (*fmt++ == *val) val++;
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if (*fmt < 32) fmt -= *fmt; /* step back? */
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} else {
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/* Environment contains a value, get it. */
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switch (*fmt) {
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case '*': radix = -1; break;
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case 'd': radix = 10; break;
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case 'o': radix = 010; break;
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case 'x': radix = 0x10; break;
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case 'c': radix = 0; break;
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default: goto badenv;
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}
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if (radix < 0) {
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/* Skip. */
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while (strchr(PUNCT, *val) == NULL) val++;
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continue;
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} else {
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/* A number. */
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newpar = strtol(val, &end, radix);
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if (end == val) break; /* not a number */
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val = end;
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}
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if (i == field) {
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/* The field requested. */
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if (newpar < min || newpar > max) break;
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*param = newpar;
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r = EP_SET;
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}
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}
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}
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badenv:
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env_panic(env);
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return -1;
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}
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/*=========================================================================*
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* env_memory_parse *
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*=========================================================================*/
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PUBLIC int env_memory_parse(mem_chunks, maxchunks)
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struct memory *mem_chunks; /* where to store the memory bits */
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int maxchunks; /* how many were found */
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{
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int i, done = 0;
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char *s;
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struct memory *memp;
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char memstr[100], *end;
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/* Initialize everything to zero. */
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for (i = 0; i < maxchunks; i++) {
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memp = &mem_chunks[i]; /* next mem chunk is stored here */
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memp->base = memp->size = 0;
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}
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/* The available memory is determined by MINIX' boot loader as a list of
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* (base:size)-pairs in boothead.s. The 'memory' boot variable is set in
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* in boot.s. The format is "b0:s0,b1:s1,b2:s2", where b0:s0 is low mem,
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* b1:s1 is mem between 1M and 16M, b2:s2 is mem above 16M. Pairs b1:s1
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* and b2:s2 are combined if the memory is adjacent.
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*/
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if(env_get_param("memory", memstr, sizeof(memstr)-1) != OK)
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return -1;
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s = memstr;
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for (i = 0; i < maxchunks && !done; i++) {
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phys_bytes base = 0, size = 0;
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memp = &mem_chunks[i]; /* next mem chunk is stored here */
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if (*s != 0) { /* get fresh data, unless at end */
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/* Read fresh base and expect colon as next char. */
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base = strtoul(s, &end, 0x10); /* get number */
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if (end != s && *end == ':') s = ++end; /* skip ':' */
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else *s=0; /* terminate, should not happen */
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/* Read fresh size and expect comma or assume end. */
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size = strtoul(s, &end, 0x10); /* get number */
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if (end != s && *end == ',') s = ++end; /* skip ',' */
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else done = 1;
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}
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if (base + size <= base) continue;
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memp->base = base;
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memp->size = size;
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}
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return OK;
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}
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